diff --git a/examples/ipc-test.mjs b/examples/ipc-test.mjs
index 807d549..1b95155 100644
--- a/examples/ipc-test.mjs
+++ b/examples/ipc-test.mjs
@@ -25,33 +25,67 @@ const delay = time => new Promise(res=>setTimeout(()=>res(),time))
   // }
 
   // const pins='2,3,4'
-  // const pins=3
+  const pins=3
   // const pins='all'
-  const pins=[1,3,5,7]
-
-  let packet = {cmd:'chip.cfg'}
+  // const pins=[1,3,5,7]
+  let packet = {cmd:'pin.cfg', pins:'all'}
+  console.dir(packet)
+  mcpclient.send(packet)
+  await delay(1000)
+  packet = {cmd:'pin.cfg', pins:'all', port:'B'}
   console.dir(packet)
   mcpclient.send(packet)
   await delay(1000)
   packet = {cmd:'pin.state.off', pins:'all' }
   console.dir(packet)
+  await delay(1000)
   mcpclient.send(packet)
+  packet = {cmd:'pin.state.off', pins:'all', port:'B' }
+  console.dir(packet)
+  mcpclient.send(packet)
+  await delay(1000)
+  // packet = {cmd:'pin.state.on', pins:pins}
+  // console.dir(packet)
+  // mcpclient.send(packet)
+  packet = {cmd:'pin.state.on', pins:'1,7', port:'B' }
+  console.dir(packet)
+  mcpclient.send(packet)
+  packet = {cmd:'pin.state.on', pins:'3,4'}
+  console.dir(packet)
+  mcpclient.send(packet)
+
+  // mcpclient.send(packet)
   // await delay(1000)
+  // packet = {cmd:'pin.state.on', pins:pins}
+  // console.dir(packet)
+  // mcpclient.send(packet)
+  // await delay(1000)
+  // packet = {cmd:'pin.status', reg:'xintf', pins:pins}
+  // console.dir(packet)
+  // mcpclient.send(packet)
+  // await delay(1000)
+  // packet = {cmd:'pin.status', pins:pins}
+  // console.dir(packet)
+  // mcpclient.send(packet)
+  // await delay(1000)
+
+
+
   // packet = {cmd:'pin.cfg', pins:pins, cfg:'toggle_switch'}
   // console.dir(packet)
   // mcpclient.send(packet)
-  await delay(1000)
-  packet = {cmd:'pin.cfg', pins:pins}
-  console.dir(packet)
-  mcpclient.send(packet)
-  await delay(1000)
-  packet = {cmd:'pin.state.on', pins:pins, }
-  console.dir(packet)
-  mcpclient.send(packet)
-  await delay(1000)
-  packet = {cmd:'pin.state.toggle', pins:pins, }
-  console.dir(packet)
-  mcpclient.send(packet)
+  // await delay(1000)
+  // packet = {cmd:'pin.cfg', pins:pins}
+  // console.dir(packet)
+  // mcpclient.send(packet)
+  // await delay(1000)
+  // packet = {cmd:'pin.state.on', pins:pins, }
+  // console.dir(packet)
+  // mcpclient.send(packet)
+  // await delay(1000)
+  // packet = {cmd:'pin.state.toggle', pins:pins, }
+  // console.dir(packet)
+  // mcpclient.send(packet)
   // await delay(1000)
   // packet = {cmd:'pin.state.toggle', pins:pins, }
   // console.dir(packet)
diff --git a/examples/mcp.mjs b/examples/mcp.mjs
index f21a1d0..f79fe14 100644
--- a/examples/mcp.mjs
+++ b/examples/mcp.mjs
@@ -8,7 +8,7 @@ import MCP230XX from '../src/mcp230xx-packet'
   ;
 (async () => {
 
-  let mcp_chip  = new MCP230XX({id:'mcp23008-27', address:0x27, bus:{host:'sbc'} })
+  let mcp_chip  = new MCP230XX({id:'mcp23008-27', address:0x26, bus:{host:'sbc'} })
 
   await mcp_chip.init()
 
diff --git a/src/commands.mjs b/src/commands.mjs
index 085e333..fee49f5 100644
--- a/src/commands.mjs
+++ b/src/commands.mjs
@@ -4,16 +4,19 @@ import { CHIP, PIN } from './config'
 
 export const chip = {
   ack: async function(packet){
-    // process packet based on command and any other props into a bus packet
-    let bus_packet = { cmd:'scan'}
-    // console.log(packet.num)
-    let bus_reply = await this.busSend(bus_packet)
-    if (bus_reply.error) return bus_reply
-    let res = { cmd:'reply', _req:packet, _reqBus:bus_packet, ack: false, address:this.address}
-    if (bus_reply.response.indexOf(parseInt(this.address,16))!=-1) res.ack = true
+    let bus = await this.busSend({ cmd:'scan'})
+    if (bus.error) return bus
+    let res = { cmd:'reply', _req:packet, _reqBus:{cmd:'scan'}, ack: false, address:this.address, scan:bus.response}
+    if (bus.response.indexOf(this.address) !== -1) res.ack = true
     return res
   },
+  // for custom chip configuration set packet.cfg='custom' then packet.setting should be a
+  // configuration byte with given format ('STR' by defaul).
   cfg: async function(packet){
+    busPacket = busPacket.bind(this)
+    // first make sure chip is in set to BANK=0 if not already
+    let bus = await this.busSend(busPacket('write',0x05,0))
+    if (bus.error) return bus
     let setting = {}
     let cfg = packet.cfg || 'default'
     if (cfg === 'custom') setting = {val:packet.setting, fmt:packet.fmt || 'STR'}
@@ -22,35 +25,15 @@ export const chip = {
       else return {error:`no chip settings for ${cfg}`}
     }
     let byte = _.byteFormat(setting.val, { in: setting.fmt, out: 'DEC' })
-    let bus_packet = { cmd:'write', args: {address:this.address, cmd:CHIP.cmd, byte:byte}}
-    // console.log ('writing mcp chip config', bus_packet)
-    let bus_reply = await this.busSend(bus_packet)
-    if (bus_reply.error) return bus_reply
-    let res = { cmd:'reply', _req:packet, _reqBus:bus_packet , response:bus_reply.response}
-    return res
+    if (byte < 128) byte += 128  // make sure BANK=1 remains on
+    bus = await this.busSend(busPacket('write',0x0A,byte))
+    if (bus.error) return bus
+    bus = await this.busSend(busPacket('read',0x05))
+    if (bus.error) return bus
+    return { cmd:'reply', _req:packet, response:_.byteFormat(bus.response,{in:'DEC',out:'STR'}) }
   }
 }
 
-
-// async writePinsCfg() {
-//   debug.L1('writing mcp pins config')
-//   for (let port in this.ports) {
-//     for (let setting in registers.pin_config) {
-//       let reg = registers.pin_config[setting]
-//       // TODO 0x10 should be based on chip config
-//       let byte = 0
-//       for (let pin of this.ports[port].pins) {
-//         byte += pin.address * pin.cfg[setting]
-//         debug.L3(`port: ${ port } pin: ${pin.id} setting: ${ setting } reg: ${ reg } byte: ${ byte }`)
-//       }
-//       await this.write(portReg(reg, port), byte)
-//     }
-//   }
-//   debug.L1('done writing mcp pins config')
-// } // end writePinsCfg
-
-
-
 // Individual Pin Configurations
 // set is for cfg: 'custom'  assume a setting is zero unless given
 // packet = { pin:, port:, cfg: , set:{dir: 0, ivrt: 0, pullup: 0, intr: 0, usedef: 0,defval: 0} }
@@ -64,51 +47,30 @@ export const pin = {
     else cfg = PIN.cfgset[packet.cfg]
     for(let name of Object.keys(PIN.setting)) {
       let op = cfg[name] ? 'on' : 'off'
-      console.log(name, op)
+      // console.log(name, op)
       let busreply = await state.bind(this)(packet,op,PIN.setting[name])
       if (busreply.error) return busreply
-      reply.response[name] = reply.status
+      reply.response[name] = busreply.status
     }
-    console.log('==============')
     return reply
   },
 
-
-  // cfg: async function(packet){
-  //   let shift = 0
-  //   let cfg = {}
-  //   let reply = { cmd:'reply', _req:packet, response:{} }
-  //   if (packet.port === 'B') shift= 0x10  // TODO check on shift amount
-  //   packet.cfg = packet.cfg || 'output'
-  //   if (packet.cfg==='custom') cfg = packet.set
-  //   else cfg = PIN.cfgset[packet.cfg]
-  //   let pins = parsePins(packet.pins)
-  //   let state = new _.Byte()
-  //   for(let name of Object.keys(PIN.setting)) {
-  //     let bus_packet = { cmd:'read', args: {address:this.address, cmd:PIN.setting[name]+shift }  }
-  //     let bus = await this.busSend(bus_packet)
-  //     if (bus.error) return bus
-  //     state.value = bus.response
-  //     let op = cfg[name] ? 'on' : 'off'
-  //     console.log(name, op)
-  //     console.log(state.toFmt('ARY'))
-  //     console.log(pins.toFmt('ARY'))
-  //     bus_packet = { cmd:'write', args: {address:this.address, cmd:PIN.setting[name]+shift, byte:state.bwOp(pins.value,op,{in:'PLC', out:'DEC'}) }  }
-  //     bus = await this.busSend(bus_packet)
-  //     if (bus.error) return bus
-  //     bus_packet = { cmd:'read', args: {address:this.address, cmd:PIN.setting[name]+shift }  }
-  //     bus = await this.busSend(bus_packet)
-  //     if (bus.error) return bus
-  //     state.value = bus.response
-  //     console.log(state.toFmt('ARY'))
-  //     reply.response[name] = state.bwOp(pins.value,'check',{in:'PLC', out:'PLC'})
-  //   }
-  //   console.log('==============')
-  //   return reply
-  // },
-
   // state is equivalent to read
-  status: packet => {
+  status: async function (packet) {
+    let reg = packet.reg ? PIN.cmd[packet.reg] : PIN.cmd.gpio
+    if (!reg) return {error:`unknown register ${packet.reg}`, packet:packet }
+    let reply = { cmd:'reply', _req:packet}
+    let pins = parsePins(packet.pins)
+    let state = new _.Byte()
+    let bus = await this.busSend(busPacket.bind(this)('read',reg, packet.port))
+    if (bus.error) return bus
+    state.value = bus.response
+    reply.port = state.toFmt('ARY')
+    reply.pins = pins.value.map(pin => {
+      if (state.toFmt('PLC').indexOf(pin) !==-1) return [pin, 'on']
+      else return [pin,'off']
+    })
+    return reply
   },
   // threse three only for output pins
   state : {
@@ -141,28 +103,25 @@ const parsePins = function(pins) {
 let busPacket = function (cmd,reg,byte,port) {
   if (typeof byte==='string') port = byte
   let shift = (port==='B') ? 0x10 : 0
-  return { cmd:cmd, args: {address:this.address, cmd:reg+shift, byte:byte } }
+  let packet = { cmd:cmd, args: {address:this.address, cmd:reg+shift, byte:byte } }
+  return packet
 }
 
 const state = async function(packet,op,reg){
   busPacket = busPacket.bind(this)
   reg = (reg!==undefined)? reg : PIN.cmd.gpio
-  console.log(op, reg)
+  // console.log(op, reg)
   let reply = { cmd:'reply', _req:packet}
   let pins = parsePins(packet.pins)
   let state = new _.Byte()
   let bus = await this.busSend(busPacket('read',reg, packet.port))
   if (bus.error) return bus
   state.value = bus.response
-  console.log(state.toFmt('ARY'))
-  console.log(pins.toFmt('ARY'))
-  // bus_packet = { cmd:'write', args: {address:this.address, cmd:reg+shift, byte:state.bwOp(pins.value,op,{in:'PLC', out:'DEC'}) }  }
   bus = await this.busSend(busPacket('write',reg,state.bwOp(pins.value,op,{in:'PLC', out:'DEC'}),packet.port))
   if (bus.error) return bus
   bus = await this.busSend(busPacket('read',reg, packet.port))
   if (bus.error) return bus
   state.value = bus.response
-  console.log(state.toFmt('ARY'))
   reply.status = state.bwOp(pins.value,'check',{in:'PLC', out:'PLC'})
   return reply
 }
diff --git a/src/config.mjs b/src/config.mjs
index 133352f..fd98506 100644
--- a/src/config.mjs
+++ b/src/config.mjs
@@ -3,7 +3,8 @@
 export const CHIP = {
   // The consifuration byte is ['NULL','INTPOL','ODR','HAEN','DISSLW','SEQOP','MIRROR','BANK']
   // see page 18 of 23017 datasheet for 8 setting details
-  cmd: 0x0A, // IOCON.BANK=0 (msb) at powerup so need to use 0x0A, if set to 1 then us
+  // MUST send '10000000' to 0x0B first to be sure you are in BANK=1 separate bank mode
+  // IOCON.BANK=0 (msb) at powerup so need to use 0x0A, if set to 1 then us
   default: {
     val: '10100010', // Split Banks port A + 0x10 = Port B,(ignored by 23008), Sequential operation disabled, active high=pulldown
     fmt: 'STR'
diff --git a/src/mcp230xx-packet.mjs b/src/mcp230xx-packet.mjs
index 14a25c6..75aeb1b 100644
--- a/src/mcp230xx-packet.mjs
+++ b/src/mcp230xx-packet.mjs
@@ -40,6 +40,10 @@ export default class MCP230XX extends Base {
 
   async init(){
     await super.init()
+    let res = await this.chip.ack.bind(this)() // move this to device class
+    if (!res.ack) throw `no device on this bus at address ${this.address}=0x${this.address.toString(16)}`
+    res = await this.chip.cfg.bind(this)({})
+    if (res.response !== '10100010') throw `could not configure mcp chip at ${this.address}=0x${this.address.toString(16)}`
   }