diff --git a/ion/src/device/bench/command/command.cpp b/ion/src/device/bench/command/command.cpp
index b8a41bdfc..645b224d9 100644
--- a/ion/src/device/bench/command/command.cpp
+++ b/ion/src/device/bench/command/command.cpp
@@ -30,11 +30,12 @@ bool isHex(char c) {
   return hexChar(c) >= 0;
 }
 
-uint32_t hexNumber(const char * s) {
+uint32_t hexNumber(const char * s, int maxLength) {
   uint32_t result = 0;
-  int8_t digit = 0;
-  while ((digit = hexChar(*s++)) >= 0) {
-    result = (result << 4) | digit;
+  int index = 0;
+  while ((maxLength < 0 || index < maxLength) && s[index] != NULL) {
+    result = (result << 4) | hexChar(s[index]);
+    index++;
   }
   return result;
 }
diff --git a/ion/src/device/bench/command/command.h b/ion/src/device/bench/command/command.h
index 5a749ed1d..5e5b9b857 100644
--- a/ion/src/device/bench/command/command.h
+++ b/ion/src/device/bench/command/command.h
@@ -31,7 +31,7 @@ extern const char * const sOFF;
 void reply(const char * s);
 int8_t hexChar(char c);
 bool isHex(char c);
-uint32_t hexNumber(const char * s);
+uint32_t hexNumber(const char * s, int maxLength = -1);
 
 }
 }
diff --git a/ion/src/device/bench/command/print.cpp b/ion/src/device/bench/command/print.cpp
index ec51a410b..8b5eb3bfc 100644
--- a/ion/src/device/bench/command/print.cpp
+++ b/ion/src/device/bench/command/print.cpp
@@ -15,8 +15,8 @@ void Print(const char * input) {
     return;
   }
 
-  char x = hexNumber(input);
-  char y = hexNumber(input+3);
+  char x = hexNumber(input, 2);
+  char y = hexNumber(input+3, 2);
 
   KDContext * ctx = KDIonContext::sharedContext();
   ctx->drawString(input+6, KDPoint(x, y));