TK-521019TERMINAL FUNCTIONTX-RX unit (X57-6820-XX A/5) Pin Name I/O FunctionNo.Pin Name I/O FunctionNo.CN71 DSR I Data set ready2 E - GND3 RXD I Serial data input4 TXD O Serial data Output5 5M - 5V6 RTS1 O Request to Send7 REM I Programmable function key input8 PTT I External PTT input9 MICE - External MIC GND10 EMC I External MIC input11 MSW/CTS I EXT/INT MIC switch input12 SP- O BTL output - for external speaker13 SP+ O BTL output + for external speaker14 SSW I EXT/INT speaker switch inputCN141 OPT1 O Scramble code output 1 (Scrambler board)O Channel busy (ANI board)I Busy (VGS-1)2 OPT3 O Scramble code output 2 (Scrambler board)I Key (ANI board)I Play (VGS-1)3 RXD1 I Serial data intput(VGS-1)4 TXD1 O PTT (Scrambler board)O Serial data output (VGS-1)5 NC - No connection6 OPT4 I/O Echo PTT (Scrambler board)O PTT (ANI board)O Enable (VGS-1)7 USEL - GND8 OPT5 O Scramble code output 4 (Scrambler board)O Emergency (ANI board)O Reset output(VGS-1)9 DGND - GND10 AGND - GND11 AI I VGS Audio Input (VGS-1)12 AO O VGS Audio Output (VGS-1)13 AGND - GND14 5A - 5V15 STON I Side tone input(ANI board)16 DI/ANI I Data input (ANI board)17 TCONT I Speaker mute signal (ANI board)18 MAN DOWN O Man-down output (ANI board)19 INH I MIC mute signal input (ANI board)20 OPT2 O Scrambler control signal output(Scrambler board)I Emergency signal input (ANI board)21 TXO O MIC signal output (Scrambler board)22 RXEO O Audio signal output (Scrambler board)23 RXEI I Audio signal input (Scrambler board)24 TXI I MIC signal input (Scrambler board)25 OPT6 O Scramble code output 3 (Scrambler board)26 SB2 O Switched B outputCN19 (K2 and K3 models only)1 LCS O LCD chip select2 GND - GND3 D0 I/O Data bus 04 D1 I/O Data bus 15 D2 I/O Data bus 26 D3 I/O Data bus 37 D4 I/O Data bus 48 D5 I/O Data bus 59 D6 I/O Data bus 610 D7 I/O Data bus 711 RD - No connection12 WR O WR bus13 GND - GND14 A0 O Address bus 0CN4081 GND - GND2 GND - GND3 MIC I External MIC input4 MICE - External MIC GND5 SP+ I BTL output + for external speaker6 PWR O Power control output7 SP+ I BTL output + for external speaker8 15V - 15V9 SP- I BTL output - for external speaker10 SB1 I Battery level input11 SP- I BTL output - for external speaker12 +B - Power input after passing through the fuse13 AF O Audio Output14 +B - Power input after passing through the fuse15 VOL I Volume level input16 +B - Power input after passing through the fuse17 CLK O Clock data output18 +B - Power input after passing through the fuse19 GND - GND20 LRST O LCD reset output21 KIN I Key input22 28M - 2.8V23 EXAFC O External AF output24 PSW I Power input after power switch25 KES O Key counter clear to send26 INAFC O Internal AF output27 DAT O Data output28 ECSW O Echo cancel MIC switch29 TGL0 I Lever switch input 030 33M - 3.3V31 TGL2 I Concentric switch input 232 33M - 3.3V33 TGL1 I Concentric switch input 134 33A - 3.3V35 CH_A I Rotary switch input 136 33A - 3.3V